"When to go China?" largely depends on your climate preference, your vacation time, personal taste and tourist seasons in China. China has a continental and seasonal climate. Southern areas are in the tropical or subtropical zone while northern areas are in the frigid zone. Climates in different areas are complicated. Every season here has its charms and pitfalls!
Located in South East Asia, China is one of the world’s most-watched and hottest incoming tourist destinations. Normally, April, May, September and October are the peak tourist months at China’s most popular places when the weather is the most comfortable.But deciding when to visit China depends on which places you wish to visit, what type of weather you enjoy, and how much budget you can afford.

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China in Spring

Spring in China is a season of recovery, commonly warm with a little rain. Spring can also be delightful with the average temperatures roughly the same as in autumn, at about 10° C - 22° C. 

China in Summer
Summer in China can be extremely hot with temperatures well above 22° C. You can go to summer resorts in some northern cities of China. Summer is also the rainy season, so travelers should not forget umbrellas, light raincoats and rubber shoes.

China in Autumn
Autumn is a season which is suitable to visit any city of China. Normally, the most comfortable season of the year in China is early autumn (September to early October). During that period, temperatures are reasonable throughout China at about 10° C - 22° C with a limited amount of rain. Autumn is a harvest season. The sky is bright and clear. Your eyes are filled with the most beautiful view of the natural world. 

China in Winter
Winter can be incredibly cold especially in the north but off-season travel can also offer its rewards. For example, the Harbin Winter Ice Lantern Festival is a charming event. The southern China in winter is not that cold.

More Tips: 
Whenever you decide to travel to China try to avoid 1-3 May (Labor holidays) or 1-7 October (National Day) when hard-working Chinese get a one week holiday; University Holidays: Summer holiday (June-September) and Winter holiday (January-February). It is extremely crowded everywhere, especially in some hot destinations in China.